HoloDust on 14 June 2017
Thery're not really comparable, apart from being about pirates in the Age of Sails.
That said, and as someone who really likes games from that period (most of the good ones are quite old and on PC), I find Skull and Bones to be arcadey garbage with ridicilous sailing and damage models - I felt this about Black Flag as well, so I admit I'm biased against it from the very start.
Sea of Thieves look interesting, but I guess it depends a lot on people with whom you play it with....maybe even too much.
